CO2 geological sequestration Nagaoka Project


Overview of the CO2 Geological Storage Project

Purpose of the CO2 Geological Storage Project

To implement CO2 geological storage technology in full scale in Japan, various research topics need to be addressed, including behavior of CO2 during and after injection, long-term stability of CO2 in the reservoir, and the potential and costs of CO2 storage.

The CO
2 geological storage project is being carried out to clarify these issues associated with CO2 underground storage. It is intended to establish a technology that can separate and capture CO2 from large-scale emission sources and store it safely in complex aquifers located in Japan over the long term. Incorporating both domestic and overseas trends, this project strives to build a solid basis for CO2 reduction by performing estimation of storage capacity, efficacy evaluation via cost analysis, and review of safety assessment methods for possible implementation of geological storage in Japan.


Project Objectives

To obtain a scientific understanding of CO
2 behavior, CO2 injection demonstration tests were conducted at the Iwanohara site in Nagaoka City, Niigata Prefecture, which is located above a Category A aquifer.

To compile the results of demonstration tests conducted at the Iwanohara site and to extend a reservoir option to Category B aquifers, a research plan for clarifying and demonstrating the trap mechanism was prepared, and issues related to storage capacity calculation and safety assessment methods were addressed.

FY2008 and after
Based on the results of the basic demonstration tests, etc. conducted on Category B aquifers, technological knowledge will be accumulated and consolidated to enable commercial-scale geological storage beginning in 2015.


R&D on Individual Element Technologies

Individual element technology Objective
(1) Development of safety assessment methods Demonstration test and monitoring at the Iwanohara site To ascertain the storage conditions by injecting CO2 into the Category A aquifer and collecting the data on CO2 behavior. To verify that stable geological storage is possible using a newly-developed long-term behavior simulator.
Basic research To provide basic data for the monitoring at the Iwanohara site. To obtain scientific knowledge which enables geological storage in the Category B aquifers.
(2) Overall evaluation Survey of potential storage capacity in Japan To present the potentiality of safe and secured long-term storage of CO2 in Japan's aquifers.
Evaluation of effectiveness To confirm the effectiveness of geological storage based on the cost analysis and the available storage capacity. To provide a road map for solving technical problems.


CO2 Injection Demonstration Tests at Iwanohara, Nagaoka City, Niigata Prefecture

CO2 injection demonstration tests were performed at the Iwanohara test site in Nagaoka City, Niigata Prefecture.

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